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Similar to proximity, Many devices also have light sensors embedded in them. To expose this to web content we should just use DOM Events similar to that of Device Motion and Device Orientation. A developer simply has to register an event listener:
window.addEventListener("devicelight", callback, true);
The callback’s parameters include:
value – the current ambient light level in SI lux units
function callback(a) {
var d = document.getElementById("d");
d.innerHTML = "<p> Current Value " + a.value
}
Like Device Proximity, the sensor will be turned on when the first listener is added. And, of course, the sensor will be turned off when the last event listener is removed.
This work is being tracked in bugzilla bug 738465. Sample webpage: http://dl.dropbox.com/u/8727858/mozilla/light/light.html
I hope to get this in for Firefox 14 or 15, and of course, B2G.
